Selwyn A, Russell W J
Anaesth Intensive Care. 1977 May;5(2):157-60. doi: 10.1177/0310057X7700500211.
Fluid flow through modern cannulae is not simple and cannot be expressed in classical terms. Progressively increasing the length of a cannula diminishes flow predictably but altering the bore of the cannula does not give a fourth power improvement in flow but rather a linear one. A reasonable working value for the relative viscosity of ACD blood in infusions would seem to be 2-6 below about 125 ml/minute flow (saline). The decline in relative viscosity above this may be caused by turbulence in the saline flow.
现代套管中的流体流动并不简单，无法用经典术语来表述。逐渐增加套管的长度会可预测地减少流量，但改变套管的内径对流量的改善并非呈四次方关系，而是呈线性关系。对于输液中ACD血液的相对粘度，在流量低于约125毫升/分钟（生理盐水）时，合理的工作值似乎为2至6。高于此流量时相对粘度的下降可能是由生理盐水流动中的湍流引起的。
